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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907a15ec8c2796a90debc8748f060bced59b6ef41fe9116c2f3b7f932f9fe7cf' 
  AND token = '6GjioJ/Qs5+E4rd44UlSw/ZUNgwLG6HAGkn6WFaPaU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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