SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06190e3b21788dbffae2b8322b77e7d2c84fe76a28cf6cf18d5cf2198b8551b' 
  AND token = '/qwKwTFBcG+Tu9lMvbnAnBS7rGa9APn3ngLjPIxZngc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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