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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba227b649b21a7a28b9992b1fb33e91e0e3b8f8ffe2511d7416dd8b07fc95bb' 
  AND token = 'Roz003uQg2iC93RDD12bspD5ljoxKWNFm5cXv6O0AzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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