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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c64ac7a521b1e69f6346adf82699991401cb6347c0338a12415e8a9bd83df975' 
  AND token = 'U9ldL2cC/pbCnHYff6P6I3FgYN0dfpuos46GM4TILYM=' 
  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"
    }
  }
}