Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aae5eac12ae2ad51005ebc9cc8637586c89706b824c95eb4c4169a11aa3fe38' 
  AND token = 'gN6WP5yXAxg6UUZTqf2RrqsFXubsaejVMh3aBRPCUD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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