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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c9d13822d0b84a60fa94027d6a21612cb36bbd491ef76a6833e5770e046ed9' 
  AND token = '3JeVXrlGsmO+3g2BM46xJPnY+pBlGOOiTV9kf3C+7IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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