SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c48bf8a7e81cf1eaf08d0095d227b9fae67452e6c156d5627e3cb8d9997ae8f1' 
  AND token = '0xZJOZiTB/HQhpGhLji+185jwgMj2HYBDKPjBnMbnBg=' 
  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"
    }
  }
}