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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b72b022284cc7984d3c45a08f7b752e69cac4ee5d21107fe62187c68ac376b2' 
  AND token = '6eBEqgsvSx8CmxoX4BM23GzqTdqq/8JnyPqCMrLB7m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}