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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f2b3998f75818a75cf6efb9e91cd7c8abff2e45b59ccd03ebb0d64b98519ee' 
  AND token = '3McQoSqUnbcLtCe1lmvH3N5z9esgzmkkV2xRVrimP9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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