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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17513a1e9e4d9dec3a4cfe52f8dd584805d8f0288b029fe62921f0aca3b8e4ec' 
  AND token = 'CL38eO1Q7K7g6WbOz4z11LbiX9xXjKRRMi575Cwy3Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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