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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a437b849f8a442f1b78eea36a4ef2212b96d991b618138152249198ad12df70' 
  AND token = '3nolzrWj4fQVcnmgO/4HIUdFVxfB4Pi29oglhF5cJcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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