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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f13984ef434c29672e7baee9dbb0327dcdee6f7abee2f383269b22bab85b2d' 
  AND token = 'eD+5HU/E7Kq0nHyGaN7aKjUqVRlNVA+7A07vAxi8JAU=' 
  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"
    }
  }
}