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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e7eee30c2f609420ddc81f1fffb128030b7c9b18ca9e1df99db0fcef036ec33' 
  AND token = '4DHsjpkURuQ7iUBtB9LIpxBy0JuzbScXpK2bdvnwfsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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