Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '959c6f25dafa9cc2d1fb32b086d44e1f3d688b85c5bad557afe185200b78aac8' 
  AND token = 'VI8k2rCY4GVUWgY5nnakmR0va8lpuo0+OhbvbTbtoCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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