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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a039f64275d412cb0731348047e73063ba58c2671fbf42d9a01d74c0c948a4a1' 
  AND token = '1/kUBCZ1/ld17TjW6PO7qyxSRAX/G2hasn3P3ST8trQ=' 
  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"
    }
  }
}