SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e5307d8aa3668c0fbc7af2186d99e01bb8ca29a612158b67fef11343d5f69c' 
  AND token = 'pbEM96UZZizk4HRJX5DtsgoENEkpKkQWhuwB/jKwgCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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