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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee08c7510427e523d29600f384b49c4e1ea872aef56c9d41ce8ec1d9a253b1f' 
  AND token = 'B6OaENv6he4jParbYUZK6Ou0khCd4IdYwhrEhwSedp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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