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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b5a031780d6bd60b8a0bd76efe8f28e6153b787e13373c6da6e509a57e733c' 
  AND token = 'wG8Lqu6kIXGA2eXLHYQ5DQWOnl6iD3yUsVRHozW3qjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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