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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd547212f80d0fa473d21384fcab1bdaa8aea8d8a94072702222cd49fee9d9734' 
  AND token = 'lHI1lmGMxUdsLWyFzJ7n1wQkBDjORo+X0oqDQOrTsnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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