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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '462bf44585e5b65e64ccc8325c825b9ef09c37828350bffa2f761f06fd840b54' 
  AND token = 'nKfAs8PN3dmR1OZ9mjqL0JFfinkQ9bPu2hdrgweBDkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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