SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bf5c96ddb6a3bd88217334960e024e6bfc25e74485a4ed863a06b8d49bac391' 
  AND token = 'i3quLR8QDwjHYIZvWBsg+EHOuoLWDqlk7wfzJUEgfNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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