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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cff8ffb003828a8c35f2d16053fd184c761c23f6d297f7b41ded650c5280f8c' 
  AND token = 'O97RoiRrnNRGyNGXfmyUr50yB7dtxbO1fFMeV1yBZWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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