Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62375ec777774fe2f18de6bcfc82d841a25c1b468b840c2f51944a9fe4ec316e' 
  AND token = 'SINdVM6HfWNGf+cmIbSCGKwc9K7kyTbMKm/NBiGQkjU=' 
  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"
    }
  }
}