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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d86936986a58a95e7ed3bf77d70cf1e29b44890ed27ea7939ef6026c9ca539c' 
  AND token = 'Bc5jDJ9Tk8eV2huRAgO3/dzGa505Nc8S2tIqKx8wsdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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