Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7413dad2f24c3779e6b946e2143f85794bcaaf94dd484fa78210b5187fc5f363' 
  AND token = 'NU+NCr5j2zsHawFMb3LUoPVHcm91WQgfsb6cOi3UJC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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