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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72d92a5b828f99097d86bf843084398782fb475f1102bcc156a4c5d1a3c1aa0b' 
  AND token = '28sVbR7BtdbxpyuHmu8WaqAPO3wPnXaIeNUlMSXw1sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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