Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae64c862d66bb3bf7643a283ee327f1c0297aadabf307e4a7f6ae20fab2449b' 
  AND token = 'sP0ohQBiyKVEfeuBiVX7ubUtXbZc/w4lTFG9HqYRSqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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