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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5380cb5944999c6f77aee13053458a1ebc39ae688c80f8008c18956c357fb393' 
  AND token = 'NKyICmBBiPwEzBkYwFYOajpR1NfqLpn8cN91XGk90nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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