SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e9705b1cf0790535f1e0f4db12dd46e5a5df9d48690054034dea4fc8289879a' 
  AND token = '+pLYdDjRjeKGKNT/w4LmISpgoOjC+uqxZlHSfzEIt/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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