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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af1e8b2eb1487ae8726b1d0373c22ef7f77e30b9943eeafbc6d72e119154e718' 
  AND token = '259FSmwkn4F/uOXJgvOgn5PjX9S6eOkevGbMkpQXiPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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