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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db27683040980f27bcf67fc86e0a0a4d35f597376ec87bd421d053b040685d1e' 
  AND token = '0Mw6Zt2HhUQv5sknejSd7EgvUdU6tIfIRrd83JWonQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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