Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58c4692b130189b3c98a06318bfbacd7e17145157a47ad4a06d0beeead4a2eb' 
  AND token = 'G/ceKVd00nqtKsWRobGEIdI3PgKRd/e+Wwh5b9MhTy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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