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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7ac416bbf703915f1d3a2908fe9d28d87fbfc165d1f1bbf67335566daef2fa' 
  AND token = 'XTuvs8NGkAK+ToVTiL0/1ruT9GjkFM337CJ/3eamZG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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