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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c512a4c1818864990f08bee0c7a5c75d3ab87b2e0a548fa531a5b0ab310325' 
  AND token = 'Z7n2lfXxht1TgtoKf9C5mT0d5gegFgY1hUO4M/ZKBU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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