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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a90a016de6d1f6d458658795f046896f09349295fc03790d3b8518f2cfc57410' 
  AND token = '1LfSh7Z+nIn8bcEgih9BmEfh8pm8DZZwK2vegrxx73A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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