Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5d109922dacbccb54d855c6d1d329e0d2bf7b9e7845b26cd51a282443d29867' 
  AND token = '5XXJMYatltNzyncR6m6vbMvPGy/+4ihvz7mMy79Y7f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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