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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e70e38eb9fb7c6285d38ee19fda94de8a8d57dcd6e3091275e38246c171f5b56' 
  AND token = 'qblepf3LhC/xrNRENFwj6bdZA4smN00e3pL45GwjQvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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