Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc488cf86f158281d6fcbdd082d892e76e5e413f5fbd73520f8aa044d97241c6' 
  AND token = 'CTMS+BWG9F7xtBzdamrCPUBZROZWQR1WC7AfWx9/CRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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