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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'debe424f3416880836c644868ef10b8b715946721c342910274844685b8c35e3' 
  AND token = '8M9qF8aE9XAHXTsGRA7FtK5N2Psci0Yp3YGs1eJ5ckQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00237

JSON explain

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