Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b12eb68cd3a7fcf0a5c46f6fc4879ff47290d86302881f29a89c62d2ea03e88' 
  AND token = 'NucbkuuuSLq6u8Bf5ODqTurdMNlNnsJP8Ji7EzdpQck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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