Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a0ff0b10f376c62eec61044d357791d967c72a4b4575a74b6ecb9197d855e5' 
  AND token = 'TtkxSIKJzlTf8dTu3BtH4Uagla8vcRJPqOpDkgep2mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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