SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bf4c2e1c520b5404d57f626c1f7b33904d361936835ad8c442a1339b454762e' 
  AND token = 'u0hXI7awwVG5hr4Q1snzgZUpaXgX25GPTVg31R6B/4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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