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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac7a4eb0ff3a883af6b4cf45f86a052b901d969e2aff81e4d8eccdca2e2f96e' 
  AND token = '0qlP0+M+WMQ7dVB2T7Bq1HpqRXYZf/nwbV5VWJLpAcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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