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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b99545b44a58f216cd5eed2f3fe7faf4a2deaecc1d7eaa813b587c7cede0a55' 
  AND token = 'iHh2dDqEI8V+5BUCFkdliDKIeqSmqZ6UpLXOcic8CsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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