Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66fedcc7b71e50c8bce10b1a7dd8eb2f7646ce4880ab8144f04e533f05354df6' 
  AND token = 'zyJTORrZS8NDRjAc2czZROtLztG7HWd/1FKqdo/gpCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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