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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20f4f67b9b4247b8e7840128d8dfbac8f92ff360a9988244cf3d99eb4eea008a' 
  AND token = '2x7lME1tAAWw470Trg6IuzTSSivLa/wWpxNp4ZtGJbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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