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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c45b6b73f10371a815140b1af5a0744caa9b67f56785c70a6e7376e6c81c0e9' 
  AND token = 'gjds2SasQ9DXe1qx24ml1ZKMzB3XolaNv0shjKYubFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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