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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe133cb104857a94c175f67387a5ffa1b614602e8be91a1875430ec92fc4585' 
  AND token = 'e7aOXOlXdsMt1eJL+Kpkeo/D/U6Fri01+7EOtfCvH3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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