SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e094b1d050db5c4683fd1eaf970e12f91a1d9055dcfb0bcf583f2374354d101a' 
  AND token = 'wSq0Z9Pr1VzH2vFljUNQKKRYdx88L2hXKjHvGfbYOZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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