Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f2ee09d18c8262142bd8760ecd18c70bb0a0a4e0e304ac60a4c6fa70dfa4d3' 
  AND token = 'Bb9SjUJOtp9qSGnwGNgU9/wINXl0I9IVpteroXjmZKQ=' 
  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"
    }
  }
}