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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48b63258ac7c1f7632e7d7be8c97a45d741e55c5b92d830ebf6a704f3a803b8f' 
  AND token = '6HEZcjtIAkuWMzya7e6ls3BV4eiLpk7UpK448EPp7Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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