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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '215ea9a4f01d28c3780b6f7439ad552195f4e7748ad46845d4ee6537b3ef0208' 
  AND token = 'DssQUi9XZZ0N0swPHkwIFI25RjyJY4H9Ta/iQVJ+Ays=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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