Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7ac937d9f928c6688a5b6502e9c15fb3a0cbcd5c127e5af9a8e0255152e871' 
  AND token = 'cjztsW8nGjN76aFJowmsrcM1Im4EB4QwctjIj82cdDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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