Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d263d8d4eddac40dad2c57bc37d6a64cee0201f01622f1794bcbec204a9305' 
  AND token = 'H6cZ4YpBy8Lfjs/Bt7n4vLLI0XM1NGsUBVL3CquKZpI=' 
  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"
    }
  }
}