Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c921d177b31645256603c734868c361448c6659d99f9af7201a6d3d2b66189e' 
  AND token = 'ln01qlI8SE/0UHsY9khhqJePgCnf8U6nnN4PLaAcSG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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