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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f68bb0c6ff33e7e9f2d0ae0b5bdbde40b955f073f1b23b82545c3ab4f1279cf' 
  AND token = '1HBJbHYFYGHjACKNulUIXXUU/46akUTACodV57bxvFs=' 
  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"
    }
  }
}