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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d333cc11408a6349d339304e95ba2431246ee15b26aa8fb6263ddd64dad00db' 
  AND token = '9GsgIeNq52aAKJ/peRFkQqKWwccBYIUZ2uQZobrj68E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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