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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f800b9cf82792a627aae2f8c924a3be9e8b63ecd7875302562ec7d77e46274ae' 
  AND token = 'AZo+0tpXAikGO1XLDX/+YBKOXS2J25lJ8RcQkXKNsvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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