SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce2492a029483a0105ce02d569aafd59c164ed4dd2cf6f577f83c6890c8ecf7b' 
  AND token = 'KGb2B9kE91X4DvCVX+SBLzghs/6nTSpNYApv0Hg8dkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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