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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd29d015562b694850b0a6d6a1f63705cc50f4da9bb2dda036550e479483575c' 
  AND token = 'sTqagcZ1bkfJcqdV5KIHP6qWQ8kS9Xrdn59mxh+TULw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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