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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fdc20e6ca3decfc83a07e4f7d5374463e5ea27c4ed370847fe2c903db582b56' 
  AND token = 'fZrtwJeGqEw/QjnCFOiEyWVDdCLMQoyJQt5YYeUON10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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