Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f40695b8ab7c4753bb5dd8ee61eb9ceb94d57e2fc14f1aa24887d4b758ae2ba' 
  AND token = 'YJWz0A15zIyaarDnuezm4gLXKIaFRJwpe37z4euyunQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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