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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3c727c9c31f2b96a265af5056ab42a2e96c1fadc9c1e38b9739b800a5bb7687' 
  AND token = 'prZUl8vZqMTMsTIABv5NiIDS6d0BBMK/A94FFMKQqRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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