Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92d831953413878979353fd45b9d4c2c6cc75d5d405d7e6cf13e83e9ac505c92' 
  AND token = 'I8El2ZEwSfefWk0TjmY4cv1DZXq/Pj+4z8GxkqacXys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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